Specifications

AQUATROL Zoning System
70-6910 213
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AQ255 and AQ257 Zoning Expansion Panel for Hydronic Zoning
System
The AQ255 and AQ257 family of AQUATROL Expansion Zoning
panels work with AQ2000 Boiler Control Panels and AQ1000
Communicating Thermostats to control up to 4 space heating
zones (or 8, for the AQ25582B Panel). Can be combined with
additional expansion zoning panels and an AQ2000 control panel
for a total of 16 space heating zones.
• AQ257 for zoning with zone valves with end switches
• Auto test function to test zones at system start up. It allows for
operator controlled testing of zones; includes pause/restart
capability.
• LED lights for visual diagnostic of zone operation.
• Allows zoning with either "Normally Open" or "Normally Closed"
zone valves.
• Adjacent zoning panels can operate different zone equipment - one
panel may control 4 pumps while another may control 4 zone valves.
• Easily switch from zone valves to pumps with same zoning module -
just flip one DIP switch. Ensure correct voltage is applied to all zone
equipment on a panel (120 Vac for pumps, 24 Vac for valves)
• R-C transformer and B-B data bus terminal connections (network
communication) for easy expansion.
• Zones can be set to energize a group pump via Aux Out dry contacts
on main control panel (AQ250, AQ25A, AQ251, AQ252) or
expansion control panel (AQ254).
• Zone synchronization through Zone of Greatest Demand control.
• 38 VA Transformer with self resetting electronic fuse.
Application: Zoning control for hydronic zoning system
Dimensions, Approximate: 9 1/2 in wide x 8 in. high x 3 3/8 in. deep
(24 cm wide x 20.3 cm high x 8.5 cm deep)
User Interface (Setting, Programming): (DIP Switches)
Electrical Connections (Line Voltage): Wire-clamp screw terminals,
Maximum 2 x 14 AWG each on line voltage terminals
Control and Zoning Panel Temperature Rating: 32 F to 130 F (0 C to
55 C)
Thermostat Compatibility: AQ1000 Series 2-wire communicating
thermostats and most digital thermostats
Zone Module Thermostat input: Low voltage, Class II, 2-wire polarity-
insensitive, digital communicating with power link to AQ1000 series
thermostat.
Zone Output Contact Rating: 120 Vac/250 Vac, 5A, 1/3 HP
B-B Communication Bus Terminals: Low voltage, Class II, 2-wire
polarity-insensitive, digital communicating link to other Control or
Zoning modules.
R-C Input (on Control and Zoning Modules): 24 Vac Class II (input
on Control and Zoning Modules)
Operating Humidity Range (% RH): 5 to 90% RH, non-condensing
Weight: 2.1 lbs (1 kg)
Approvals:
Canadian Standards Association: CSA C/US Certified to CSA and
UL Standards, File No. LR76030
Product Number
Type of Zoning Devices
Controlled
Number of
Zones
Controlled
Weight
Replacement Parts(kg) (lb)
AQ25542B Zone pumps or 2-wire valves (line
voltage)
4 1 kg 2.1 lbs AQ15540B 4-zone pump expansion module
AQ25582B Zone pumps or 2-wire valves (line
voltage)
8 1.3 kg 2.6 lbs AQ15540B 4-zone pump expansion module
AQ25742B 2-wire valve (24 Vac) 4 1.8 kg 3.9 lbs AQ10X38 24 Vac 38 VA transformer;
AQ15540B 4-zone pump expansion module
AQ25744B Zone valves with end switches (24
Vac)
4 1.8 kg 3.9 lbs AQ15740B 4-zone valve with end switch expansion module;
AQ10X38 24 Vac 38 VA transformer